VBScript to get directory size if over N GB then delete oldest 'Folder' to recover space - vbscript

Question

I'm very new to bat scripting and would like to be able to do the following:
I have a main 'backups' folder which in turn contains unique folders for individual daily backups taken (i.e. named 'backup (date/time'). Within these individual daily backup folders they contain both files and folders.
I would therefore like to be able to check the main 'backups' folder and if the size is greater then say 50GB then the oldest folder and anything contained within is deleted.
I came across the script below in the Forum which does what I'm looking for, but on files rather then folders. Due to my elementally level of scripting, I'm not sure how straightforward it would be to adapt have it work with folders or if there is something else already available.
Many Thanks
Set fso = CreateObject("Scripting.FileSystemObject")
Set F = fso.GetFolder("C:\Users\User\Desktop\New Folder\Stories\Test")
If F.size > 2^30*2 Then
'Comments on a stupid editor that can't handle tabs
'Creating an in memory disconnected recordset to sort files by date
Set rs = CreateObject("ADODB.Recordset")
With rs
.Fields.Append "Date", 7
.Fields.Append "Txt", 201, 5000
.Open
For Each Thing in f.files
.AddNew
.Fields("Date").value = thing.datelastmodified
.Fields("Txt").value = thing.path
.UpDate
Next
.Sort = "Date Desc"
Do While not .EOF
fso.deletefile .Fields("Txt").Value
If f.size < 2^30*2 then Exit Do
.MoveNext
Loop
End With
End If

Answer 1

Here's code that does what you are looking for:
Dim objFSO
PurgeBackups "C:\Temp"
Sub PurgeBackups(p_sRootFolder)
Dim objRootFolder
Dim objOldestFolder
Dim fOldestInitialized
Dim objFolder
Dim lngFolderSize
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objRootFolder = objFSO.GetFolder(p_sRootFolder)
fOldestInitialized = False
For Each objFolder In objRootFolder.SubFolders
lngFolderSize = GetFolderSize(objFolder)
If lngFolderSize > 50000000000# Then
' Decide if you want to delete this Folder or not
If Not fOldestInitialized Then
Set objOldestFolder = objFolder
fOldestInitialized = True
End If
' Compare date
If objFolder.DateCreated < objOldestFolder.DateCreated Then
Set objOldestFolder = objFolder
End If
End If
Next
If fOldestInitialized Then
' Delete oldest folder
objOldestFolder.Delete
End If
End Sub
Function GetFolderSize(p_objFolder)
Dim objFile
Dim objFolder
Dim lngFolderSize
lngFolderSize = 0
For Each objFile In p_objFolder.Files
lngFolderSize = lngFolderSize + objFile.Size
Next
For Each objFolder In p_objFolder.SubFolders
lngFolderSize = lngFolderSize + GetFolderSize(objFolder)
Next
GetFolderSize = lngFolderSize
End Function

Answer 2

Please find below my attempt which has been based on an existing script and modified to suit, with a few extra flurries . . . I would be grateful for comment.
strOldestFolder = ""
dtmOldestDate = Now
Set oShell = CreateObject("WScript.Shell")
strHomeFolder = oShell.ExpandEnvironmentStrings("%USERPROFILE%\HDBackups")
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFolder = objFSO.GetFolder(strHomeFolder)
intFolderSize = Int((objFolder.Size / 1024) / 1024)
If intFolderSize >= 50 Then ' change as appropriate, value in MBytes
Set objSubFolders = objFolder.SubFolders
For Each objFolder in objSubFolders
strFolder = objFolder.Path
dtmFolderDate = objFolder.DateCreated
If dtmFolderDate < dtmOldestDate Then
dtmOldestDate = dtmFolderDate
strOldestFolder = strFolder
End If
Next
objFSO.DeleteFolder(strOldestFolder)
End If
One aspect that I'm not entirely happy with is the look and neatness of the 'str' and 'Set' in the first six code lines, I would like to be group them together, i.e. all the Sets together. But so far have been unable to do so without the script failing.
Note: have used 50MB rather then the 50GB as per original description, makes testing a bit easier.